Characterization and Physicochemical Modifications of Polymer Hollow Fiber Membranes for Biomedical and Bioprocessing Applications
Date of Award:
Doctor of Philosophy (PhD)
David W. Britt
David W. Britt
Timothy A. Taylor
Anne J. Anderson
Hollow fiber membranes (HFMs) formed through phase inversion methods exhibit specific physicochemical characteristics and generally favorable surface and mechanical properties, supporting their use in diverse applications including ultrafiltration, dialysis, cell culture, bioreactors, and tissue engineering. Characterization of, and modifications to, such membranes are important steps in achieving desired characteristics for specific applications. HFMs subject to gas, irradiation, and chemical sterilization techniques were characterized based on several analytical techniques. It was revealed that these common sterilization techniques can cause inadvertent changes to HFM properties. While these changes may cause detrimental effects to HFMs used in filtration, the methods of sterilization are also presented as a facile means of tuning properties toward specific applications. Modifications to HFM surface chemistries were also sought as a method of adsorbing bacterial lipopolysaccharide (LPS) from solutions used in hemodialysis treatments and bioprocessing applications. It was found that additives such as polyvinylpyrrolidone (PVP), polyethyleneglycol (PEG), and poly-L-lysine (PLL) can facilitate adsorption capacities of HFMs toward LPS. Additionally, chemical changes are presented as a means of preferentially adsorbing LPS to specific locations on the HFM surface.
Madsen, Benjamin R., "Characterization and Physicochemical Modifications of Polymer Hollow Fiber Membranes for Biomedical and Bioprocessing Applications" (2010). All Graduate Theses and Dissertations. 577.
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